/Engine/Source/Runtime/GeometryCore/Public/Intersection/IntrTriangle3Triangle3.h
Solve a common sub-problem for triangle-triangle intersection  find the sub-segment (or point) where a triangle intersects a coplanar segment
Number of points representing the intersection result (0 for none, 1 for point, 2 for segment)
static int IntersectTriangleWithCoplanarSegment ( const [TPlane3](API\Runtime\GeometryCore\TPlane3)< Real > & plane, const [TTriangle3](API\Runtime\GeometryCore\TTriangle3)< Real > & triangle, const [TVector](API\Runtime\Core\Math\TVector)< Real > & end0, const [TVector](API\Runtime\Core\Math\TVector)< Real > & end1, [TVector](API\Runtime\Core\Math\TVector)< Real > & OutA, [TVector](API\Runtime\Core\Math\TVector)< Real > & OutB, Real Tolerance )